Alert archive / Colorado / Tornado Warnings in 1988

Tornado Warning 10, NWS Denver/Boulder, CO

June 15, 1988Adams County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 15, 1988, 4:05 PM MDT for Adams County, Colorado. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Jun 15, 1988, 4:05 PM MDT (22:05 UTC)
Expired
Jun 15, 1988, 4:35 PM MDT
In force
30 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Adams County, CO

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.1 hours before the alert went out and 95 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 1988-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1988-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
37 J/kg
Mixed-layer CIN
-227 J/kg
Mixed-layer LCL
1300 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 152207
TORDEN
COC001-152235-
 
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
405 PM MDT WED JUN 15 1988
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 430 PM  MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
 
     WESTERN ADAMS
 
INCLUDING THE FOLLOWING TOWNS/CITIES:
 
A TORNADO HAS BEEN SIGHTED ON THE GROUND JUST NORTH OF STAPLETON
INTERNATIONAL AIRPORT.  MOVEMENT UNKNOWN.
 
IN HOMES GO TO THE BASEMENT OR INTO A CLOSET OR BATHROOM.
IN SCHOOLS..HIGH RISES AND HOSPITALS GO TO AN INTERIOR
HALLWAY ON THE LOWEST FLOOR.  IF IN MOBILE HOMES OR VEHICLES..
EVACUATE THEM AND GO TO A SUBSTANTIAL SHELTER.  IF NO SHELTER
IS AVAILABLE..LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT.
IN ALL CASES..STAY AWAY FROM WINDOWS..DOORS AND OUTSIDE WALLS.
 
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE
IN DENVER..OR CALL YOUR REPORT TO THE NATIONAL WEATHER SERVICE
AT 361-0663.  DO NOT CALL THIS NUMBER FOR INFORMATION.
 
JLW
LAT..LON  4000 10497 3999 10460 3974 10473 3977 10490

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 15, 1:54 PM MDT, 2 hours 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
145PM MET WED JUN 15 1988

...TORNADO WATCH FOR MUCH OF EASTERN COLORADO...

A TORNADO WATCH IS IN EFFECT FOR MUCH OF EASTERN COLORADO FROM 2PM
THIS AFTERNOON UNTIL 9PM THIS EVENING...WEDNESDAY JUNE 15TH. LARGE
HAIL...STRONG WINDS...AND LOCALLY HEAVY RAIN ARE POSSIBLE WITH THESE
STORMS.

AT 145 PM THIS AFTERNOON A LINE OF THUNDERSTORMS WAS FORMING FROM
EASTERN BOULDER COUNTY SOUTHWARD TO SOUTHERN JEFFERSON COUNTY. STRONGEST
CELLS WERE JUST WEST OF PALMER LAKE. MOVEMENT WAS TOWARD THE EAST
AT AROUND 10 MILES PER HOUR.

ANOTHER AREA OF STORMS WAS LOCATED IN NOTHERN LARIMER COUNTY...ALSO
MOVING TOWARD THE EAST AT AROUND 10 MILES PER HOUR.

SOME OF THESE STORMS MAY DROP AN INCH OR SO OF RAIN IN A SHORT PERIOD
OF TIME. MOTORISTS SHOULD BE ALERT FOR ROAD AND STREET FLOODING AND
PONDING OF WATER IN LOW LYING AREAS.

FURTHER STATEMENTS OR WARNINGS WILL BE ISSUED AS REQUIRED.
A
TUNNELL
Special weather statement, Jun 15, 2:34 PM MDT, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
230PM MDT   WED   JUNE 15 1988

                 ...THUNDERSTORM IN LARIMER COUNTY...

A LINE OF THUNDERSTORMS EXTENDS OVER THE FRONT RANGE FOOTHILLS FROM THE
WYOMING BORDER TO PALMER LAKE COLORADO.  THE HEAVIEST CELL WAS IN
LARIMER COUNTY NEAR RED FEATHER LAKES.  A WEATHER SPOTTER REPORTED
PEA SIZE HAIL AND HEAVY RAIN BETWEEN 2 AND 215 PM MDT 2 MILES SOUTHEAST
OF RED FEATHER LAKES.

PERSONS THROUGHOUT EASTERN COLORADO SHOULD WATCH FOR SEVERE WEATHER FOR
THE REST OF THE AFTERNOON.  A TORNADO WATCH HAS BEEN POSTED FOR MOST OF
EASTERN COLORADO FROM 2PM MDT UNTIL 9PM MDT.  HAIL...STRONG WINDS...
HEAVY RAIN ARE POSSIBLE WITH THESE THUNDERSTORMS.  MOTORISTS SHOULD BE
ALERT FOR ROAD AND STREET FLOODING IN LOW LYING AREAS AS SOME OF THE
THUNDERSTORMS COULD DUMP AS MUCH AS 1 INCH OF RAIN IN AN HOUR OR LESS.
MONITOR LOCAL NEWS MEDIA OR NOAA WEATHER RADIO FOR ADDITIONAL WEATHER
BULLETINS AND FORECASTS.

ADDITIONAL STATEMENTS OR WARNINGS WILL BE ISSUED AS NEEDED.

END...WSFO DENVER
Special weather statement, Jun 15, 3:31 PM MDT, 34 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
330PM MDT   WED   JUNE 15 1988

          ...HAIL AND HEAVY RAIN IN WELD AND LARIMER COUNTIES...

STRONG THUNDERSTORMS HAVE BEEN PRODUCING HEAVY RAIN AND HAIL IN LARIMER
AND WESTERN WELD COUNTIES.  AROUND 3PM MDT A SPOTTER REPORTED PEA SIZE
HAIL 3 MILES SOUTH OF WAVERLY COLORADO IN EASTERN LARIMER COUNTY.  AT
320PM MDT MARBEL TO PEA SIZE HAIL FELL 5 MILES SOUTH SOUTHEAST OF CARR
COLORADO ALONG WITH HEAVY RAIN.

PERSONS THROUGHOUT EASTERN COLORADO SHOULD WATCH FOR SEVERE WEATHER FOR
THE REST OF THE AFTERNOON.  A TORNADO WATCH IS IN EFFECT FOR MOST OF
EASTERN COLORADO FROM 2PM MDT UNTIL 9PM MDT.  HAIL...STRONG WINDS...
HEAVY RAIN ARE POSSIBLE WITH THESE THUNDERSTORMS.  MOTORISTS SHOULD BE
ALERT FOR ROAD AND STREET FLOODING IN LOW LYING AREAS AS SOME OF THE
THUNDERSTORMS COULD DUMP AS MUCH AS 1 INCH OF RAIN IN AN HOUR OR LESS.

TWO STRONG THUNDERSTORMS WERE ON A COLLISION COURSE IN NORTHWESTERN
WELD COUNTY IN THE VICINITY OF NUNN COLORADO.  WHEN THESE TWO CELLS
MERGE WEATHER CONDITIONS MAY BECOME EVEN WORSE IN AND AROUND NUNN...15
MILES NORTHEAST OF FORT COLLINS.  WATCH FOR LARGE HAIL...VERY STRONG
AND POSSIBLY sDAMAGING WINDS...HEAVY RAIN AND INTENSE LIGHTNING.

ADDITIONAL STATEMENTS OR WARNINGS WILL BE ISSUED AS NEEDED.

END...WSFO DENVER
Special weather statement, Jun 15, 4:02 PM MDT, 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
4PM MDT   WED   JUNE 15 1988

          ...STRONG THUNDERSTORMS IN NORTHEASTERN COLORADO...

STRONG THUNDERSTORMS HAVE BEEN PRODUCING HEAVY RAIN AND HAIL IN LARIMER
AND WESTERN WELD COUNTIES AS WELL AS IN THE SOUTHEAST AURORA AREA.
TWO OUTFLOW BOUNDARIES HAVE COLLIDED IN WESTERN ADAMS COUNTY BETWEEN
STAPLETON AIRPORT AND BRIGHTON COLORADO AND A VERY STRONG THUNDERSTORM
IS EXPECTED TO FORM IN THIS AREA BY 5PM MDT AND POSSIBLY EXTEND TO THE
SOUTHWEST INTO NORTHERN DENVER...COMMERCE CITY AND THORNTON.  BE ALERT
FOR HEAVY RAIN...HAIL...AND STRONG GUSTY WINDS IN THESE AREAS WITHIN THE
NEXT HOUR OR SO.

PERSONS THROUGHOUT EASTERN COLORADO SHOULD WATCH FOR SEVERE WEATHER FOR
THE REST OF THE AFTERNOON.  A TORNADO WATCH IS IN EFFECT FOR MOST OF
EASTERN COLORADO FROM 2PM MDT UNTIL 9PM MDT.  HAIL...STRONG WINDS...
HEAVY RAIN ARE POSSIBLE WITH THESE THUNDERSTORMS.  MOTORISTS SHOULD BE
ALERT FOR ROAD AND STREET FLOODING IN LOW LYING AREAS AS SOME OF THE
THUNDERSTORMS COULD DUMP AS MUCH AS 1 INCH OF RAIN IN AN HOUR OR LESS.

SPOTTER REPORTS INDICATE THAT 1/2 INCH DIAMETER HAIL FELL NEAR CARR
AROUND 325PM MDT AND 1/4 INCH HAIL FELL ALONG 1-25 NEAR THE COLORADO
WYOMING BORDER AT THE SAME TIME.  ONE THUNDERSTORM PRODUCED HAIL OF
1 AND 3/8 INCH DIAMETER AT SMOKY HILL AND GUN CLUB ROAD IN EXTREME
SOUTHEAST AURORA AROUND 315PM MDT.

ADDITIONAL STATEMENTS OR WARNINGS WILL BE ISSUED AS NEEDED.

END...WSFO DENVER

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 15, 4:19 PM MDTTornado WarningBOUAdams, Arapahoe, Denver41 min
Jun 15, 4:51 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Morgan, Washington, Weld59 min
Jun 15, 4:51 PM MDTSevere Thunderstorm WarningBOULogan59 min
Jun 15, 5:17 PM MDTTornado WarningBOUMorgan, Weld33 min
Jun 15, 5:45 PM MDTTornado WarningBOULogan, Morgan, Washington30 min

Nearby

Tornado Warnings in Colorado, 1988Every tornado warning in 1988Tornadoes in 1988

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.